This paper uses random assignment in professional golf tournaments
to test for peer effects in the workplace. We find no evidence that
playing partners' ability affects performance, contrary to recent evidence
on peer effects in the workplace from laboratory experiments,
grocery scanners, and soft fruit pickers. In our preferred specification,
we can rule out peer effects larger than 0.043 strokes for a one
stroke increase in playing partners' ability. Our results complement
existing studies on workplace peer effects and are useful in explaining
how social effects vary across labor markets, across individuals,
and with the form of incentives faced. (JEL D83, J44, L83)